TM 10-4320-317-13
c.
Minimum Requirements. Minimum requirements for selecting the route are as follows:
(1) A sketch of the proposed hoseline route.
(2) Odometer distances.
(3) Enough topographic information (surveying altimeter elevations) to establish relative altitude at various points
along the hoseline route.
d.
Route Guidelines. The following guidelines should be utilized to gain maximum effectiveness for installation and
operation of the system:
(1) The route should be direct and present a minimum number of obstacles and obstructions.
(2) A route parallel to a secondary all-weather road is preferable to one along a heavily traveled road.
(3) If roadways do not exist or cannot be utilized, select a route that is accessible to vehicles required for laying
the hoseline.
(4) Plan to locate junction of two hoseline lengths at installation sites for each boost pumping station and storage
assembly.
(5) Keep security precautions in mind. Utilize natural camouflage wherever possible and avoid routing hoseline
through populated areas.
e.
Pumping Station Sites. In selecting pumping station sites, the location of the lead or first pumping station will be
determined by location of the water source. Boost pumping stations are intended to be spaced at approximately 2-
mile intervals, assuming that the route is reasonably direct and the terrain is level. However, a substantial rise or
fall in elevation along the hoseline route may require adjustment of standard spacing intervals:
(1) If the next downline pumping station is substantially higher in elevation than the upline pumping station, the
distance between them must be shortened.
(2) If the next downline pumping station is substantially lower in elevation than the upline pumping station, the
distance between them must be lengthened.
f.
Spacing Adjustments. Adjustments to spacing between pumping stations (due to elevation change) assure that
water pressure will be maintained within optimum operational range. Under normal conditions, TWDS will deliver
water to the suction port of each boost pumping station at a pressure of 20 psig (139 kPa). Whenever suction
pressure falls below 20 psig (139 kPa), boost pumping stations are designed to begin reducing speed, when
operated in the automatic mode. Therefore, if an upline pumping station is substantially lower than the next
downline station, and the elevation difference has not been offset by spacing adjustment, suction pressure at the
downline pumping station may fall below 20 psig (139 kPa) and cause that pump to slow down. This in turn will
cause remaining downline boost pumping stations to slow down, seriously degrading overall performance of
TWDS.
g.
Ground Profile. A ground profile (drawn on graph paper) and a pump spacing triangle can be utilized to determine
the location of each boost pumping station. To construct a ground profile, first obtain a topographical map or other
source material which provides accurate information concerning terrain along projected hoseline route. Then,
using this information, draw a ground profile (see Figure 2-2) of the hoseline route on graph paper as follows:
(1) Divide the horizontal base of the graph into spaces that represent uniform distances, such as 1000 ft (305 m)
intervals. However, any suitable scale can be used. The base of the graph represents the horizontal distance
that the hoseline will cross.
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